1. health and fitness
2. disease
3. cancer

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1
Hormone therapy
In this fact sheet:
• How does hormone therapy treat
prostate cancer?
• Who can have hormone therapy?
• What types of hormone therapy are there?
• What happens afterwards?
• What are the side effects?
• Where can I get support?
• Questions to ask your doctor or nurse
• What are the advantages
and disadvantages?
• More information
• What does treatment involve?
• About us
This fact sheet is for men who are thinking
about having hormone therapy to control
their prostate cancer. It is one of a set of fact
sheets to help you decide which treatment is
best for you. Partners and family members
may also find this information helpful. The
fact sheet describes the different types of
hormone therapy, how they are used and
their possible side effects.
How does hormone therapy treat
prostate cancer?
Each hospital or GP surgery will do things
slightly differently. Use this fact sheet as a
general guide to what to expect and ask
your doctor or nurse for more details about
the treatment and support available to you.
If you would like to know more about
anything you read in this fact sheet, you
can call our Specialist Nurses on our
confidential helpline.
Hormone therapy works by stopping the
hormone testosterone from reaching the
prostate cancer cells.
Testosterone is produced by the testicles and
adrenal glands. One of its roles is to control the
development and growth of the sexual organs,
including the prostate gland. Normal levels of
testosterone do not usually cause any problems,
but if there are cancer cells in the prostate gland,
testosterone can cause them to grow faster. In
other words, testosterone ‘feeds’ the prostate
cancer. If testosterone is taken away, the cancer
cells shrink, wherever they are in the body.
Hormone therapy alone will not get rid of your
prostate cancer but it can keep it under control
for many months or years before you and
your doctor may need to consider additional
treatment options. It can also be used with other
treatments to help make them more effective.
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Who can have hormone therapy?
Hormone therapy is a treatment option for
many men with prostate cancer, but it is used in
different ways depending on the stage of your
cancer. Speak to your doctor or nurse about
your individual treatment options.
Localised prostate cancer
If your cancer has not spread outside the prostate
gland, your doctor may offer you hormone therapy
alongside your main treatment.
Radiotherapy
You may be offered hormone therapy for a few
months before starting radiotherapy. Radiotherapy
uses high energy X-ray beams to destroy the
cancer cells. Hormone therapy shrinks the prostate,
which makes the cancer easier to treat because
there is a smaller area for the radiotherapy to target.
You may continue to have hormone therapy at
the same time as radiotherapy. If there is a risk
of the cancer spreading outside the prostate
gland, you may continue to have hormone
therapy for between six months and three years
after radiotherapy.
Brachytherapy
You may be offered hormone therapy for a
few months before having permanent seed
brachytherapy, to shrink the prostate. Permanent
seed brachytherapy treats prostate cancer using
radioactive seeds implanted in the prostate gland.
You may be offered hormone therapy for a few
months before having high dose rate (HDR)
brachytherapy, to shrink the prostate. HDR
brachytherapy involves inserting a source of
high-dose radiation into the prostate gland for
a few minutes at a time to destroy cancer cells.
You may continue to have hormone therapy after
your treatment.
2
the prostate gland (locally advanced prostate
cancer). Hormone therapy treats prostate cancer
wherever it is in the body.
You may be offered radiotherapy as well as
hormone therapy, depending on how far your
cancer has spread. Some research has suggested
that a combination of hormone therapy and
radiotherapy may be more effective than hormone
therapy alone in men with locally advanced disease.
Advanced prostate cancer
Hormone therapy will be a life-long treatment for
many men with prostate cancer that has spread
to other parts of the body (advanced or metastatic
prostate cancer). Hormone therapy treats prostate
cancer wherever it is in the body. It cannot cure the
cancer but it can keep it under control for many
months or years before you may need to consider
other treatment options.
Hormone therapy keeps the cancer under control
by shrinking it and delaying its growth. How long
hormone therapy will control the cancer varies from
man to man. It may depend on how aggressive
your cancer is and how far it had spread when
you started treatment. It is difficult for doctors to
accurately predict how long hormone therapy will
keep your cancer under control.
Unsure about your diagnosis and
treatment options?
If you have any questions about your
diagnosis ask your doctor or nurse. They
will be happy to explain your test results and
talk you through your treatment options. It is
important you feel you have enough time and
all the information you need before making
a decision about treatment. We have more
information about diagnosis in our Tool Kit.
You can also speak to our Specialist Nurses
on our confidential helpline.
Surgery (radical prostatectamy)
Hormone therapy is not usually offered to men
with localised disease who are having surgery.
What types of hormone therapy
are there?
Locally advanced prostate cancer
You will usually be offered hormone therapy if
your cancer has spread to the area just outside
There are three main types of hormone therapy
for prostate cancer. These are:
• injections or implants to stop your testicles
making testosterone
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• surgery to remove the testicles or just
the parts of the testicles that make
testosterone (orchidectomy)
• tablets to block the effects of testosterone.
Injections or implants
These work by blocking the message from
the brain that tells the testicles to make
testosterone. Without testosterone, the prostate
cancer cells are not able to grow. There are
two main types of drugs that stop your testicles
making testosterone. These are LHRH agonists
(luteinizing hormone-releasing hormone agonists)
and GnRH antagonists (gonadotropin-releasing
hormone antagonists).
LHRH agonists
There are several different LHRH agonists and
they all work in the same way. They are given by
injection into your arm, stomach area (abdomen)
or bottom (buttock). Some LHRH agonists are
available as a small implant, injected under your
skin. You may have the injections at your GP
surgery or local hospital once a month, once
every three months, or once every six months,
depending on the dose. Some of the common
LHRH agonist drugs are listed below:
• goserelin (brand names: Zoladex®, Novgos®)
• leuprorelin acetate (brand name: Prostap®)
buserelin acetate (brand name: Suprefact®
• triptorelin (brand names: Decapeptyl®,
Gonapeptyl Depot®).
One type of LHRH agonist is available as an
implant, injected under the skin of your arm
once a year, but it is not as widely available as
some of the other LHRH agonists. It is called
the histrelin implant (brand name: Vantas®).
The implant is a small plastic cylinder that is
inserted under the skin of your upper arm.
Before you have your first injection of an LHRH
agonist, you may have a short course of antiandrogen tablets (see page 4). This is to prevent
the body’s normal response to the first injection,
which is to produce more testosterone. This
temporary rise in testosterone could cause the
cancer to grow more quickly for a short time,
which is known as a flare. The anti-androgen
tablets help to stop this flare from happening.
3
You will usually start taking the tablets a week or
so before the first injection and continue taking
them for a week or two afterwards.
GnRH antagonists or blockers
At the moment, there is only one kind of GnRH
antagonist available in the UK, called degarelix
(Firmagon®). It is not available in every hospital. It
is newer than most other hormone therapies, so
we do not know much about side effects or how
effective it is in the long term.
You will have an injection of degarelix just under
the skin of your stomach area (abdomen) once
a month. When you first start this treatment,
you will have two injections on the same day.
Degarelix does not cause a temporary rise in
testosterone with the first treatment, so you will
not need to take anti-androgen tablets.
Surgery to remove the testicles
(orchidectomy)
This type of hormone therapy involves surgery,
called an orchidectomy, to remove the testicles
or just the parts of the testicles that make
testosterone. Without testosterone, the prostate
cancer cells are not able to grow. Surgery is just
as effective as injections. It cannot be reversed
so it is usually only offered to men who need
long-term hormone therapy.
If you are thinking about having an orchidectomy,
your doctor may suggest trying injections or
implants (see above) for a while first to see
how you cope with the side effects of lowered
testosterone levels. If you decide to have
the surgery, you will have this under general
anaesthetic so you will be asleep during the
whole process and will not feel anything.
Short term side effects include swelling and
bruising of the scrotum, which is the sack
containing the testicles. For details of longer
term side effects of orchidectomy and other
types of hormone therapy, see page 6.
Some men may not like the idea that surgery
cannot be reversed. Some may also worry
about how their body will look afterwards. Your
surgeon can answer any questions you have.
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You may be able to have an implant (prosthesis),
which looks and feels like a normal testicle, at
the same time as the operation.
Tablets to block the effects of testosterone
Anti-androgens
Anti-androgens work by stopping testosterone
from reaching the prostate cancer cells.
Without testosterone, the cancer cells are
not able to grow. Anti-androgens are taken
as a tablet, at least once a day. They can be
used on their own, before having injections or
4
implants, together with injections or implants,
or together with surgery to remove the testicles
(orchidectomy). You can ask your doctor how
long you will need to take the tablets for. There
are several different anti-androgens, including:
• bicalutamide (one brand name is Casodex®)
• flutamide
• cyproterone acetate (one brand name
is Cyprostat®).
What are the advantages and disadvantages?
Type of hormone Advantages
therapy
LHRH agonists
• Side effects may be reversed
by stopping treatment.
• They are just as effective at
controlling prostate cancer
as orchidectomy.
• They are less likely to cause
breast swelling than
anti-androgens.
Disadvantages
• You may need a short course of
anti-androgens to help stop ‘flare’
happening (see page 3).
• Side effects include erectile
dysfunction and hot flushes.
• You will need to visit the GP or
hospital every month, every three
months or every six months.
GnRH antagonists • Side effects may be reversed
• Side effects include erectile
by stopping treatment.
dysfunction and hot flushes.
• They are just as effective at
• You will need to visit the GP
controlling prostate cancer
or hospital every month.
as orchidectomy.
• They are less likely to cause breast
swelling than anti-androgens.
• They do not cause a temporary
rise in testosterone so you will not
need to take anti-androgen tablets
(see above).
Orchidectomy
• It is a one-off treatment.
• It is just as effective at controlling
• The operation and the side effects
• Side effects may be reversed
• You need to remember to take
by stopping treatment.
• Because testosterone is still being
produced, it may be possible to
maintain erections and libido.
• They do not cause bone thinning
and osteoporosis.
tablets every day.
• They may cause breast swelling
and some erectile dysfunction.
• They are less effective than
LHRH agonists at treating cancer that
has spread to other parts of the body.
are not reversible.
prostate cancer as LHRH agonists. • Side effects include erectile
• It is less likely to cause breast
dysfunction and hot flushes.
swelling than anti-androgens.
• You will need a general anaesthetic.
Anti-androgens
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What does treatment involve?
The type of hormone therapy you have will
depend on the stage of your cancer, the other
treatments you are having and your own
personal preferences. You may have more than
one type of hormone therapy at the same time.
Depending on which type of hormone therapy
you have, you may visit the hospital or your
GP surgery for treatment. You will have regular
prostate specific antigen (PSA) tests which
will help to check how well your treatment is
working. PSA is a protein produced by some
of the cells in your prostate gland. The PSA
test is a simple blood test that can measure
the amount of PSA in your blood. If your PSA
level falls, this usually suggests your treatment
is working. You will continue to have the same
amount (dose) of hormone therapy even if your
PSA level falls. This is because the hormone
therapy is controlling the cancer and if you stop
having it, the cancer may grow more quickly. You
may like to ask your doctor or nurse how often
you will have a PSA test.
Your doctor, nurse or GP will also monitor any
side effects you have from your treatment and
any other symptoms.
Your doctor may suggest different ways of using
hormone therapy, such as combined androgen
blockade, and stopping and starting treatment
(intermittent hormone therapy).
Combined androgen blockade
Your doctor may suggest a way of using
hormone therapy called combined androgen
blockade. It involves using both an LHRH
agonist and an anti-androgen to treat the cancer.
Some studies suggest that combined androgen
blockade is slightly more effective than using an
LHRH agonist alone in men whose cancer has
spread to other parts of the body (advanced
prostate cancer). However, we need more
research to know for sure whether combined
androgen blockade makes a difference to
these men.
5
Because the risk of side effects can be higher
with combined androgen blockade, it is not
commonly used as a first treatment for prostate
cancer. It is usually only offered if the hormone
therapy you are taking has become less effective
at controlling your prostate cancer.
Stopping and starting treatment
(intermittent hormone therapy)
This may be an option for men who are on
long-term hormone therapy. It involves stopping
treatment when your PSA level is low and
steady, and starting treatment again when your
PSA starts to rise. This process is repeated for
as long as it continues to work. Your doctor
will advise you on when you will stop and
start treatment.
The advantage of intermittent hormone
therapy is that you may be able to avoid side
effects during the time that you are not having
treatment. However, it can take three to nine
months, or sometimes longer, for the side effects
to wear off. Researchers think that intermittent
hormone therapy may be just as effective
at treating prostate cancer as continuous
treatment, but this is still being tested in clinical
trials. We do not yet fully understand all of
the benefits and risks of intermittent hormone
therapy and it may not be suitable for all men.
What happens afterwards?
Hormone therapy will be a life-long treatment for
many men with prostate cancer. Your original
hormone therapy may keep your prostate
cancer under control for many months or years.
However, over time the behaviour of your cancer
cells may change and your cancer may start
to grow again. Although the prostate cancer is
no longer responding to your original type of
hormone therapy, it may still respond to other
types of hormone therapy or a combination
of other treatments. You can read more about
treatments for prostate cancer that is no longer
responding to your original hormone therapy
in our Tool Kit fact sheet, Treating prostate
cancer after hormone therapy.
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What are the side effects?
Like all treatments, hormone therapy has a risk
of side effects. All types of hormone therapy can
cause side effects, including surgery to remove
the testicles (orchidectomy). It is important
to discuss the possible side effects with your
doctor or nurse before you start any treatment.
If you know what side effects you might get,
it can be easier to cope with them.
Hormone therapy affects different men in different
ways. There is no way of knowing in advance which
side effects you will get and how bad they will be.
Some men who are having hormone therapy may
have few side effects or may not have any side
effects at all. This does not mean that the treatment
is any less effective. Some men may find that
their side effects get better or easier to cope
with the longer they are on hormone therapy.
The risk of getting each side effect depends on
which type of hormone therapy you are having
as well as how long you take it for. If you are
having hormone therapy alongside another
treatment, you may get side effects from that
treatment as well.
The side effects of hormone therapy are caused
by lowered testosterone levels. In most cases, side
effects will last for as long as you are on hormone
therapy. If you stop your hormone therapy, your
testosterone levels will rise again and some of
the side effects may reduce slowly over time.
Surgery to remove the testicles (orchidectomy)
cannot be reversed but there are treatments that
can help to reduce some of the side effects.
If you have any concerns about your side effects
or if you get any new symptoms while you are
having treatment, speak to your doctor or
nurse, or call our Specialist Nurses on our
confidential helpline.
We have described the most common side
effects of hormone therapy here. For more
detailed information about these side effects
and ways to help manage or reduce them, read
our booklet, Living with hormone therapy:
a guide for men with prostate cancer.
6
Loss of sex drive and erection problems
Hormone therapy can affect your sex life
in two different ways.
• It can reduce, or cause you to lose, your
desire for sex (libido).
• It can give you problems with getting and
keeping an erection (erectile dysfunction).
Anti-androgens are less likely to cause erectile
dysfunction than other types of hormone
therapy. However, if you have advanced prostate
cancer, anti-androgens taken on their own are
not as effective at controlling the cancer as other
types of hormone therapy.
There are several treatments available for erectile
dysfunction, including tablets, injections, pellets,
vacuum pumps and implants. You can read
more about these in our Tool Kit fact sheet,
Sex and prostate cancer.
Hot flushes
Hot flushes are a common side effect of
hormone therapy. They give you a sudden
feeling of warmth in the upper body and can be
similar to those experienced by women going
through the menopause. Hot flushes can vary
from a few seconds of feeling overheated to a
few hours of sweating that can stop you from
sleeping or cause discomfort.
There are a number of different options to help
you manage hot flushes, including lifestyle changes,
drug treatments and complementary therapies.
Bone thinning
Long-term hormone therapy may cause your
bones to gradually lose their bulk. LHRH
agonists, GnRH antagonists and surgery to
remove the testicles (orchidectomy) may all have
this effect. If bone thinning is severe, it can lead
to a condition called osteoporosis. This can
result in an increased risk of bone fractures.
Anti-androgens do not cause bone thinning.
There are a number of lifestyle changes such as
physical activity and changes to your diet that
may help to reduce your risk of bone thinning
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and developing osteoporosis. Speak to your
doctor or nurse before you start any kind of
exercise plan.
Breast swelling and soreness
Hormone therapy may cause swelling
(gynaecomastia) and soreness in the breast
area. This can affect one or both sides and can
range from mild sensitivity to ongoing pain. The
amount of swelling can also vary from a small
degree of swelling to a more noticeable
enlarged breast area.
Breast swelling is more common in men
who are having anti-androgens on their
own than in other types of hormone therapy.
There are a number of options available that
can help to reduce your risk of breast swelling
and soreness or help to treat it. These include
treating the breast area with a single dose of
radiotherapy, tablets and surgery.
Tiredness (fatigue)
Hormone therapy for prostate cancer can cause
extreme tiredness. While some men may not feel
tired at all, other men may experience tiredness
that affects their everyday life. You may find that
your tiredness improves over time. Many men
find that regular resistance exercise such as fast
walking, swimming and exercising with small
weights gives them more energy and helps them
to cope with treatment.
Strength and muscle loss
Hormone therapy can cause a decrease in
muscle tissue and an increase in the amount
of body fat. This can change the way your
body looks and how physically strong you feel.
Regular resistance exercise such as fast walking,
swimming and exercising with small weights
may help to reduce muscle loss and keep your
muscles strong.
Weight gain
You may notice that you start to put on weight,
particularly around the waist. Some men find this
physical change difficult to cope with, particularly
if they have never had any problems with their
weight in the past.
7
Physical activity and a healthy diet can help you
stay a healthy weight. For more information,
read our Tool Kit fact sheet, Diet, exercise and
prostate cancer.
Risk of diabetes, heart attack and stroke
Some studies have found that men receiving
hormone therapy may have an increased risk
of diabetes, heart disease and stroke. We need
more research before we know the exact link
between hormone therapy and these conditions.
You may be able to reduce your risk by eating
a healthy diet, doing regular physical activity,
limiting the amount of salt you eat, avoiding
smoking and cutting down on alcohol.
Talk to your GP about how often you should have
regular health checks. You can find out more about
healthy eating and physical activity in our Tool Kit
fact sheet, Diet, exercise and prostate cancer.
Memory and concentration
Some studies have shown that hormone
therapy can affect your memory and ability
to concentrate. But we do not know for sure
whether this is caused by the hormone therapy
or whether other factors, such as hot flushes
and fatigue, may play a part. You may find it
helps to keep your mind active, for example, by
doing crosswords or other puzzles.
Changes to your mood
Hormone therapy may affect your mood.
You may feel more emotional than usual or just
‘different’ to how you felt before. Some men may
also experience low moods or depression. This
can be as a direct result of hormone therapy, a
response to the shock of diagnosis or the impact
that treatment can have on your life. Talking
to someone about this may help. If you think
you might be depressed, try to get help early
on. Anti-depressants are often good at treating
hormone therapy-related depression.
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Where can I get support?
As well as getting medical help to treat your
cancer, you may find that it helps to talk to your
partner, family or friends about how you are
feeling. Sharing concerns can help you to cope
better and make decisions about your treatment
or side effects easier to deal with. If people close
to you know about your feelings and concerns
they may be able to help. You could also speak
to your doctor or nurse, or speak to one of
our Specialist Nurses by calling our
confidential helpline.
If you would like to speak to a professional
counsellor, you can ask your GP if there is one
available on the NHS or you can get a list of
private counsellors from the British Association
of Counselling and Psychotherapy (see page 11
for contact details).
Some people find that it helps to talk to
other men with prostate cancer. There are
prostate cancer support groups throughout the
country. You can ask your specialist nurse for
details or you can find a list of support groups on
our website at prostatecanceruk.org
We can also arrange for one of our support
volunteers, who has experience of hormone
therapy, to speak to you over the phone.
Please call our Specialist Nurses on our
confidential helpline for more information.
If you have access to the internet, you can
sign up to Prostate Cancer UK’s online
community, where you can share your views
and experiences with others affected by
prostate cancer. Our website address is
prostatecanceruk.org
You can find more information on support
for men having hormone therapy in our booklet,
Living with hormone therapy: a guide for men
with prostate cancer.
8
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Questions to ask your doctor or nurse
You may find it helpful to keep a note of any questions you have
to take to your next appointment.
What is the aim of treatment?
What type of hormone therapy are you recommending for me and why?
How often will I have follow-up appointments?
How long will it be before we know if the hormone treatment is working?
What are the possible side effects?
What other treatments are available if the cancer starts to grow again?
What will happen if I decide to stop my treatment?
9
Treatment
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10
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More information
British Association for Counselling and
Psychotherapy (BACP)
www.itsgoodtotalk.org.uk
Telephone: 01455 883300
BACP will help you find qualified counsellors.
They are happy to discuss any queries or
concerns you have about choosing a
counsellor or the counselling process.
CancerHelp UK
www.cancerhelp.org.uk
Freephone: 0808 800 4040
(9am–5pm, Mon–Fri)
CancerHelp is the patient information website of
Cancer Research UK and provides information
about living with cancer.
Macmillan Cancer Support
www.macmillan.org.uk
Freephone: 0808 808 0000
(9am-8pm, Mon-Fri)
Provides practical, financial and emotional
support for people with cancer, their family
and friends.
UK Prostate Link
www.prostate-link.org.uk
Guide to reliable sources of prostate
cancer information.
About us
Prostate Cancer UK fights to help more men
survive prostate cancer and enjoy a better life.
This fact sheet is part of the Tool Kit. You can
order more Tool Kit fact sheets, including an
A-Z of medical words, which explains some of
the words and phrases used in this fact sheet.
All of our publications are available to download
and order from the website. You can also order
printed copies by calling 0800 074 8383 or
emailing literature@prostatecanceruk.org
11
At Prostate Cancer UK, we take great care to
provide up-to-date, unbiased and accurate facts
about prostate cancer. We hope these will add
to the medical advice you have had and help you
to make decisions. Our services are not intended
to replace advice from your doctor.
References to sources of information used in the
production of this fact sheet are available at
prostatecanceruk.org
This publication was written and edited by:
Prostate Cancer UK’s Information Team
It was reviewed by:
• Dr Howard Cohen, GP, Elizabeth House
Medical Practice, Surrey
• Christopher Eden, Consultant Urologist,
The Royal Surrey County Hospital, Guildford
• Dr Heather Payne, Consultant Clinical
Oncologist, University College
London Hospitals
• Prostate Cancer Voices
• Prostate Cancer UK Specialist Nurses
Tell us what you think
If you have any comments about our
publications, you can email:
literature@prostatecanceruk.org
or write to the Information Team at:
Prostate Cancer UK
100 Cambridge Grove
London W6 0LE
Speak to our
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